I just ran across this as well and found a workaround. I also submitted a support request so hopefully it will be fixed in the next version of MATLAB.
I believe that the problem is MATLAB includes an incompatible version of the libnssutil3.so library with xulrunner (i.e., the builtin web viewer). If you first load MATLAB's web viewer before calling findpeaks, then the incompatible libnssutil3.so is already in memory and you see the above error. If you start a new MATLAB session and first call findpeaks before calling web, then findpeaks will run successfully. I added the following code to my startup.m so I don't have to remember to do this manually:
tmp = findpeaks([1 2 3]);
fprintf('Error caught:\n%s\n', ME.message);
Try it yourself: Start a new MATLAB session, and run the following code:
That should work. Now restart MATLAB and run the following code:
You should get the error.